Rats can carry hordes of disease pathogens that can be transmitted to humans and livestock. But aside from their medical importance, Rodents are serious economic pests as they damage consumer goods and structures causing great financial losses to business and property owners.

Common rat species in the Philippines

Norway Rat or Brown Rat

Rattus Norvegicus

Appearance: Bristly brown fur, with black hairs dispersed throughout

Size: Up to 20 inches

This is one of the largest rat species commonly found in urban areas, usually with outdoor burrows. They frequent drains or canals and will venture inside commercial factories, buildings or homes for food. This rat is considered to be a medically important species because it hosts many diseases (like leptospirosis), and can carry fleas.
Oriental house Rat

Rattus tanezumi

Appearance: Has orange hair on the front edge of its ears, with long black guard hairs

Size: Up to 9 inches

This species is known to be a very widespread and destructive rodent pest indoors and outdoors. It is also a medically important pest as it is known to be a host to many zoonotic diseases.
Malaysian field Rat

Rattus tiomanicus

Appearance: Grizzled olive-brown with scattered medium-length black guard hairs, and the underparts are whitish.

Size: Up to 13 inches

This species is only reported in Palawan, but can be a pest as their normal forested and usual habitats are disturbed by human developments.
Ricefield Rat

Rattus argentiventer

Appearance: Yellowish brown in color with a silver belly

Size: Up to 1 foot

This rat species is typically found in most agricultural settings, and has been reported to be found in Laguna, Mindoro, and Mindanao.
Polynesian Rat

Rattus exulans

Appearance: Dark brown upper parts and stiff, spine-like hairs

Size: Up to 9 inches

This species is found in all parts of the Philippines, and usually lives in shrubs and grasslands.
House Mouse

Mus musculus

Appearance: Gray, light brown to black in color with large, rounded ears

Size: Up to 7 inches

This is the smallest, most invasive pest mouse found in the Philippines due to its widespread presence. Mice are not usually deterred by human activity in any urban or rural setting. Their area of activity is fairly small at 10 square meters, but can breed in large numbers given the available food and harbourage.

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Why rodent management is a must

Disease carriers
They can be a host to several diseases (like leptospirosis), bacteria, viruses and other microorganisms
Transmit veterinary diseases
Rats can transmit veterinary diseases to livestock, causing costly death of chicken and swine
Contaminates with excretions
Rats contaminate about ten times of the food they eat with their excretions and hair.
Financial losses
For both production businesses and farms, rats can cause serious financial losses.
Parasite carriers
They host parasites like plague-carrying fleas, worms, etc. that can cause sickness or death

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PCAP Training, 2020
Dr. I. Lit, Jr.
Urban Pest Control, A Practitioner's Guide
P. Dhang
Handbook of Pest Control
A. Mallis

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